AC not cold

Why Aircon Not Cold? 6 Possible Reasons Air Conditioner Is Not Cold Enough

Is your Aircon Not Cooling Enough?

We know how you feel especially the hot and humid weather in Singapore. Things get tricky when the weather becomes very hot. Things can get unbearable indoors if the aircon is not cold.

From our vast experience, the main reason is usually caused by lack of aircon maintenance.

In this article, we explain the common reasons that make your aircon not cold.

  • AC Filter Is Dirty
  • Faulty Compressor
  • Aircon Coolant Is Leaking
  • Dirty Or Leaky Evaporator Coils
  • Thermostat Is Faulty

Sounds complicated? If you need help, feel free to contact us for FREE consultation.

Cool Earth is the fastest leading aircon servicing contractor.

Cool Earth Aircond Services Front Office
  • Our lead technician has 18 years of aircon servicing and repair experience.
  • 12 technicians with at least 3 years’ experience
  • Provide same-day or next day emergency service
  • Office hours start from 8 am to 10 pm daily
  • 100% fix all your aircon problems at an honest aircon service price.
  • Specialise in troubleshooting aircon leaking problem
  • Specialise in more than 6 popular air conditioner brands
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Recommended. Take longer time to service but happy its being cleaned thoroughly.
Denise Dunigan
Denise Dunigan
03:27 24 Mar 21
Simply one of the best in town! Professional and prompt services. We have booked their services both for residential and corporate spaces. The team, led by Michael, was really warm to deal with, and they tried to be as transparent as possible in guiding us about the repair they were doing. As a repeat client, I cannot recommend them enough. If you want quick response from the team, you can simply contact them through their website. An customer specialist will immediately be in touch with you more
07:31 15 Jul 20
Book an appointment easily via whatsapp and the aircon technicians Brendon assigned arrived on schedule.I also want to say that they provided great service and were really through in explaining my issues. They were also really nice and made sure to clean up after performing their work. Great job guys!read more
Yi Ting Lee
Yi Ting Lee
05:18 24 Nov 20
Great professional services. We've had bad experiences with professional cleaners and aircon specialists before, so we were naturally wary about this at first. Fortunately, after our third try, we found the professional partner for our home (and even our home office). You can readily sense that they have been doing this for years because of their efficient system, from booking to dispatching. Their aircon specialists are also skilled and I heard from one of the specialists that they are required to renew their license annually. Great thanks and great job!read more
Jacqualine Rolle
Jacqualine Rolle
01:51 02 Aug 20
Highly recommended! TQ.
03:11 04 May 21
Thanks for the great job and clean up the mess after servicing. Will use again.
Adam BT
Adam BT
06:05 19 May 21
Looks good to me. Not big surprised but ok.
Tarra Gardener
Tarra Gardener
03:47 26 May 21
Easy to set appointment. The aircon chemical wash did the job to remove all the bad smell. Recommended.
Jimmy Gorrell
Jimmy Gorrell
02:07 28 Jun 21
CoolEarth AC is one of the best companies where you can get the services you need when it comes to aircon servicing, maintenance and repair. They are affordable and provide great customer service too!read more
Marjorie Perrotta
Marjorie Perrotta
02:27 31 Jul 21
On time and responsive by customer service. Helped to arrange same-day service on confirmation.
04:03 26 Jul 21
The technicians at CoolEarth AC really know what they're doing when it comes to aircon repair and service! Their rates are good too which is always a plus!read more
Voncile Yea
Voncile Yea
02:51 31 Jul 21
Just wanted to say a big thank you to the team! I was having some trouble with my aircon and they were able to come and take a look at it very quickly. They were able to repair the leak and get my aircon up and running again in no time! Great service, would definitely more
Collette Goh
Collette Goh
06:23 27 Mar 22
We had lots of problems with our air conditioning unit. It was not cooling the room properly and it was leaking water at some point. Luckily, cool earth came to solve all these problems for us! We are now enjoying cool air inside our home because of their more
Theresa Soh
Theresa Soh
06:23 14 Feb 22
Honest service from the technician Mr Nick. Knowing we spend alot for the servicing previously from another company but still doesn't fix the issue, he suggested a cheaper alternative. Show us the problem, clean it up and our aircon works great ever since. Knowledgeable on LG aircon. Booking was easy , replies through WhatsApp was fast more
Adi Isnin
Adi Isnin
04:40 18 Jan 22
Serviced by Brendon, did for 2 wall mounted unit and helped to check Aircon condition and informed us the prevailing possible issue. We opt for cooling gas top up also, the service was fast and efficient, thumbs up for the more
10:48 05 Oct 21
Got my 3 aircon units serviced (general cleaning, chemical treatment and gas top-up), and work was done well. Brendon was very professional and made sure to explain to me what the condition/issues of the units are before doing any additional more
Nicole Golloso
Nicole Golloso
08:57 06 Aug 22
Very good service, prompt replies and did everything via WhatsApp, including arranging site survey as well as installation + cleaning. Very reasonable prices and service team always arrive early or on time. Installation was faster than expected. Highly more
Chong-U Lim
Chong-U Lim
03:51 28 Apr 22
Technician vacuum AC evaporator coil

Below are some of the possible reason why.

1. Your AC Filter Is Dirty and Blocking the Air Flow

A dirty air filter makes the AC work overtime with irregular air management being the first thing that goes wrong. A clean and well-maintained filter will allow cool air to flow into the house.

The dust that accumulates around it cause it to slightly heat up and this affects the proper flow of cold air. Also, the dirt means the unit is supplying polluted air.

A quick check of the air filters every month to ensure it is clean and working properly can help correct the problem.

Spray water on outdoor condenser coil

2. Issues With The Faulty Compressor – Not Blowing Cold Air

The compressor is a vital component in any aircon.

Its primary function is to cool air before pumping it out into the room. If the compressor has problems, its function is hampered.

Issues related to the AC not providing cold air may stem from the compressor being blocked, and this means the flow of cooled air is not possible. The blockage could be caused by dust, dirt and tiny debris which is a rare thing and should be corrected by a skilled technician.

Dirt or debris may not block the compressor, and it still fails to work as it should.

In most cases, it could be frozen causing the entire aircon unit not to work properly.

Ideally, the compressor is meant to condense air so that it is cool or cold before pumping it into the room.

It runs and a freezing temperature and can at times freeze over due to various issues that may include being blocked by dirt and debris.

Have the compressor checked, defrosted, and repaired so that it can cool the air.

panasonic aircon condenser unit

4. The Aircon Coolant Is Leaking and  Cause Air Con Not Cold

The compressor pumps a special fluid called a coolant or refrigerant which the AC cannot do without if it is to cool the air.

The principles of how the compressor works inside the AC unit are the same as those of how it works inside a fridge whereby the fluid is pumped and recycled as it runs through evaporator coils to cool the air.

If the refrigerant is leaking, then there will not be an adequate amount in your aircon for the unit to work correctly and generate cold air. Having the coolant refilled and any leaks repairs will solve the problem.

5. Dirty Or Leaky Evaporator Coils Within Your Air Conditioning

The evaporator is a series of coils through which the refrigerant circulates to cool air.

It is a vital component in the AC that is responsible for the cold air you want the unit to produce. It will not work as it should if it is dirty.

repairing ac evaporator coil

At times, it may leak, and this may also affect its efficiency.

Cleaning it and ensuring that it is not leaking the coolant can be all that is required to have the air conditioner unit producing cold air.

6. The AC Thermostat Is Faulty

At times, the aircon unit may run when switched on yet fail to generate cold air.

The necessary components that are tasked with cooling air may be in good working condition, but nothing is happening.

The problem, during such circumstances, could be with the thermostat which could be broken or acting up.

It may not be reading the set temperature readings thus failing to trigger the entire AC system to generate cold air. The remedy for this problem is to change the thermostat.

broken aircon compressor unit

Additional Issue Of Concern Why Aircon Not Cooling

It is possible that your aircon keeps breaking down, which could be due to one of two things.

Either you are using an old unit with worn-out parts or the aircon unit is not the right size for your home. The aircon will not be able to produce enough cold air for your home if it is too small a unit.

Ensure that you have the right size so that it does not have to work so hard to deliver the preferred room temperature conditions.

How do you repair an air conditioner that isn’t cold enough?

1. Check To Be Sure The Thermostat Is Set On Cool 

Most of the time, you don’t have to work too hard to repair an air conditioner that isn’t blowing cool air. Before you call a technician, be sure that the thermostat is set on “cool” and that the room’s temperature is low enough for the unit to turn on.

2. Inspect Your Circuit Breaker Box

If the thermostat is not causing your aircon problem, then you should check your circuit breaker box. A majority of air conditioners are made up of two separate components – the outdoor unit and the indoor unit. If your outdoor device is not powered on, then the indoor until will be unable to supply your house with cold air. Try to reset any circuit breaker that is ripped and then wait a while to see if the problem happens again. If this problem persists, then you will need to call a professional expert to solve the problem.

3. Clean Any Dirty Air Conditioner Filters

If your aircon filters are dirty your system will operate less effectively and have to work harder. This can result in your electricity bills increasing without getting the cold air that you want. Be sure to wash your filters once a month at least.

4. Check To See If The Aircon Has Any Ice Build-Up

Another common problem that aircon units tend to experience once in a while is ice build-up. Over the long run, that can result in poor cooling performance. If you are experiencing this issue, try turning the unit off and lifting up the cover to see whether or not there is ice build-up. Usually, it will occur over time after the fan blower becomes damaged.


For the above information, it is clear that the aircon not generating cold air or working correctly is due to poor maintenance.

It is important to service the air conditioner at least once a year with minor maintenance checks done after every one or two months.

Need Our Help?



Why is my aircon not cooling the room anymore?

This could signal a problem in your compressor, the part of AC that is responsible for creating the cold air. Dirty aircon may also cause your aircon to take a lot of time to achieve the desired temperature.

I can’t adjust the temperature of my aircon lower, what could be the problem?

This could be an issue in your thermostat that may need recalibrating, or some particle that is blocking your condenser causing difficulty of cooling down the room.

If my AC is not cooling, should I turn it off?

The logic is often: "It is cooling a bit, so I am going to leave it on to give myself some cool air." This is a big mistake. There are a few problems with this way of thinking. If your system is iced up or frozen (which might not be obvious), then we cannot diagnose or fix the problem until all of the ice has thawed. That can take a few extra hours of our time (which means your repair costs will be more expensive), or we will need to reschedule your repair for a different time so that the system will have time to thaw out naturally.

Why doesn't might AC cool at night?

If an air conditioning system doesn't have enough air flowing through it, the evaporator will eventually freeze and result in your air conditioning unit freezing up and quit working. Dirty air filters are the most common cause of the problem. Dit may also collect on the actual evaporator coil and cause it to clog up. Typically that will occur when an air conditioning system is allowed to operate with a very dirty filer, without a filter at all, one the is of poor quality or a filter that is too small for your system. Blocked vents and ducts or a faulty fan can also cause airflow problems.

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